Solar Water Works technology utilizes Photoelectrocatalytic Oxidation (PECO), which is a method of purifying water using UV light. It does this with a low-temperature photocatalyst which is activated by sunlight. UV light excites electrons from the valence band to the conduction band of the semiconducting catalyst. A small electrical bias voltage, supplied by a photovoltaic solar panel, significantly increases the activity of the catalyst by preventing electron-hole recombination. The resulting hole in the valence band of the catalyst initiates oxidation reactions producing Hydroxyl radicals and chlorine ions. These powerful oxidants destroy most water contaminants.